User guide

Glossary G-3
G
bit/s
Bits per second; the basic unit of measure for serial data transmission capacity;
Kbits (kilobits) for thousands of bits per second; Mbitps (megabits) for millions
of bits per second, and Gbits (gigabits) for billions of bits per second.
Blue Alarm
An unframed sequence of All Ones normally sent by a DSU/CSU that cannot
maintain the required pulse density in AMI mode or sent by a CSU that has a
loss of signal condition on its data port. The signal is sent to maintain
continuity of transmission and to notify the far-end that a transmission fault
exists on the line. Same as Alarm Indication Signal (AIS).
broadband
Services or interfaces that operate above the T1 data rate, typically at NxT1, T3,
SONET, or ATM speeds.
BPV (Bi Polar Violation)
Occurs when the ones bit is not represented with the opposite signal of the
previous ones bit.
C
CCITT
International Telegraph and Telephone Consultative Committee.
central ofÞce (CO)
The phone company switching facility or center; usually a Class 5 end ofÞce, at
which subscribers' local loops terminate.
channel
A physical or logical path allowing the transmission of information; the path
connecting a data source and receiver.
circuit
Generally referring to a transmission medium connecting two or more
electronic devices.